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Question

Yield of a well per unit drawdown is called .............................

The correct answer is

Specific capacity

When a well is pumped, the water level in it falls; this lowering is called drawdown (s). The pumping rate is the discharge or yield (Q).

Specific capacity is defined as the discharge of a well per unit drawdown: \(\text{Specific capacity} = \dfrac{Q}{s}\), commonly expressed in m3/day per metre or L/min per metre. A higher value indicates a more productive well and aquifer.

Specific yield is the volume of water that drains from a unit volume of saturated aquifer under gravity, and specific retention is the volume held back against gravity; both are aquifer properties, not well performance measures.

Safe yield is the amount of water that can be withdrawn from a groundwater basin each year without producing undesirable effects such as long-term depletion.

Therefore the yield of a well per unit drawdown is its specific capacity.

Hence, Specific capacity.

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